7842478 has 16 divisors (see below), whose sum is σ = 14152320. Its totient is φ = 3184056.

The previous prime is 7842451. The next prime is 7842481. The reversal of 7842478 is 8742487.

It is a happy number.

It is a super-2 number, since 2×7842478² = 123008922360968, which contains 22 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 7842478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14476 + ... + 15007.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^7842478 is an apocalyptic number.

7842478 is a deficient number, since it is larger than the sum of its proper divisors (6309842).

7842478 is a wasteful number, since it uses less digits than its factorization.

7842478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29511.

The product of its digits is 100352, while the sum is 40.

The square root of 7842478 is about 2800.4424650401. The cubic root of 7842478 is about 198.6786054764.

Subtracting 7842478 from its reverse (8742487), we obtain a palindrome (900009).

The spelling of 7842478 in words is "seven million, eight hundred forty-two thousand, four hundred seventy-eight".